Core-barrel for drilling-machines.



l. M GIBEAU.

CORE BARREL FOR DRlLLNG MACHINES.

APPLICATION HLED MM2?, asis.

l l 7 9., l 73 Patented Apr. 11, 1916 JOSEPH M. GIBEAU, 0F TILESABA, MINNESOTA.

CORE-BARREL FOR DR'ILLING-MACHINES.

Specification of Letters Patent.

Patented Apr. 11 1916.

.Application led May 27, 1915. Serial No. 30,861.

To all whom t may concern v Be it known that I, JosErH M. GIBEAU. a citizen of the United States, residing at Mesaba, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in CoreBar-` rels for I)rilling-l\/Iacliines, of which the following is a specification, reference being had therein to the accompanying drawing. My invention relates to improvements in core-barrels for drilling machines.

The object of my invention is to provide a core-barrel for a diamond drill having means whereby water is supplied to both the outside and inside of the core-barrel and at the same time providing means for allowing a circulation of water from the inside of the core-barrel to the outside. l

Another object of my invention is. to provide a simple, cheap and more eli'ective eonstruction adapted to accomplish the above results and having certain details of .struc ture and combination of parts' hereinafter more -fully Set forth. v

Referring now to the drawings-Figure 1 is a vertical sectional view of my improved core-barrel attached to the drill stock and also showing the diamond drill head attached. Fig. 2 is a transverse horizontal sectional view taken on the line .fir-fr, Fig. 1, and looking downward. Fig. 3 is an enlarged side elevation,- partly broken away,

|of the auxiliary core-barrel.

Referring now to the drawing, 1 reprev sents the internal coi'ediarrel having at its lower end `the reduced portion 1', screwthreaded and having screwed thereon the diamond carrying drill head 2, and which barrel, together with its attachment, forms the bit of the boring machine. The upper end of the core-barrel 1 is internally enlarged at 2 and internally screw-threaded. Into this screw-threaded portion the reduced threaded portion 18 of the stock 1S is screwed, so as to bring the outer faces of the barrel and the stock flush, as fully shown in Fig. 1 of the drawings. The upper end of the stock 18 is operated in the usual Inanner, as is wel] understood by those l skilled in the art and needs no further description.

Within the core-barrel 1 is an inner auxiliary core-'barrel 3, having corrugations 4' on its outer periphery', which extend the entire length thereof. These corrugations, as shown in Fig. 2, of the drawings, are on two opposite sides and the remaining two opposite sides being left blank, as indicated at 5 and 5. Fig. 2 of the drawings. This barrel is designed to 'fit snugly within the outer barrel and to have two holes 6 6 extending through the blank sides 5 and 5', which opeuings register exactly with the two smaller openings 7 and 7 extending through the walls of the outer core-barrel 1, as shown in Fig. 1 of the drawings.

W'hen the inner auxiliary core-barrel 3 is in' place within the outer barrel 1, a tapering plug 8, is fitted within each of the holes formed by the registration of the holes 6 and 7 and designed to be forced tightly therein so as to cause its extreme ends to termi-nate Hush with the outer extremities of the holes, thus firmly locking the two barrels together. united, the lower end of the inner auxiliary core-barrel 3 terminates within a Short distance of the lower end of the outer corebarrel 1, forming a space between the ends of the barrel and the inner shoulder 3- of the drill head 2, when the latter is up tight against the end of the outer core-barrel. This space 9, as fully shown in Fig. 1 of the drawings. is for the purpose of allowing the free discharge of water from the grooves or corrugations 4, within the walls of the inner barrel 3 and between it and the outer barrel 1. The plugs 8 are each provided through their centers with a passageway or holes 10, the purpose of which will bellater described.

The upper end ot' the inner core barrel 3 is screw-threaded at 11 and has screwed therein the plug 12, which hasa downwardly projecting barrel portion 13, extending beyond the threaded portion 11. Two opposite walls of the barrel portion 13 have formed therein openings'le` which communicate with the openings 10 in the plugs 8.

When the barrels are thus The interior of the barrel portion 13 is fitted ,i

with any desired form of' wire screen 15 to prevent the passage of granular material through the openings 1.0 with the water. The upper end of the plug 12 isi`forined with a rectangular recess 16 adapted to receive a plug wrench whereby the saine may be readily screwed into or removed from the inner corebarrel 3, as will be readily understood.. The stock 1S of the drilling machine, as heretofore stated. is screwed into the outer corebarrel 1, and is of a hollow form so as to provide means for supplying water to the' drill, as will be later described.

Froiuthe foregoing description it will be seen. that the stock 18 is supplied with water which downwardly therethrough and enters the upper ends of the grooves si., between the inner barrel 3 and the outer barrel l. The water then passes downwardly through the grooves and inwardly through the :spa-ee 9 at the lower end oi"the barrel, at a point just above the diamond drill` head and is thus 'ed uninterrupted to a point adjacent the grinding end of the bit. Some ot' the water passes downwardly and out around the end of the hit on the outside thereof. The remainder of the water will pass on up around the eore 19 and from the upper end thereofl and through the screen i and out through the openings 1Q to the outside of the eorebarrel l, and downwardly to the outside of the bit. 'This will insure a perfect feed or" the water to all of the working parts oi the drili and thus produce a drill having the greatest possible eiiicienoy.

Having thus deseribed my invention, what I Claim and desire to seeure by Letters Pat-- entis:

i, A drili of the Character deseribed, cornprising an outer core-barret, an iuner coreberrel terminating' above the lower end of the outer core-barrel and having a plurality of longitudinail;7 extending' grooves in 'the outer surface thereof, a dril head screwed upon and abutting against the iower end of the outer eore-i` irrel, whereby a water discharge space is formed intermediate the lower end of the inner core barrel and the upper edge of the inner wall of the head, a plug within the upper end of the inner con'- barrehand having a Chamber therein oommunieating with a plurality of openings through the core-barrels to without the oute core-barrel., means within the chamber for preventing the openings therein becoming fouled with granular materiai7 the head of the piug itting down snugly over the upper end of the inner core-barrel, but in such a manner as to leave readiiy accessible the upper ends of the longitudinal grooves, whereby water may freely circulate therethrough to the cutting head of the drill as and for the purpose described.

2. The combination with an inner corebarrel for drills having formed upon the major portion of two sides thereof a plurality of longitudinally extending water circulating grooves and the other two sides formed the full size of the outside diameter oi the barrel, an outer core-barrel having a bore in which the inner Core-barrel snugly fits the abutting portions of the two barrels having registering openings extending therethrough, which openings occur on the outside diameter of the inner core-barrel where the said core-barrel has its full size, and

.means within the openings for fixing the inner-'and outer barrels rigidly together.

3. A drill of the Character described, comprising an outer core-barrel, an inner coreliarrel, the inner core-barrel terminating above the lower end of the outer core-barrel, a drill head carried'by the lower end of the outer core-barrel, continuous longitudinally extending grooves from the upper end of the inner core-barrel to the lower end thereof, a

plug within the' upper end of the lcme-barrel and having chamber therein communicating with the interior of the inner core-barrel. means within the chamber for preventing the openings therein frombecoming fouled with granuiar material, the said inner and outer core-barrels having registering openings communicating with the said chamber for passing'olf an accumulation of liquid from the chamber to the outside of the outer core-barrel, the' parts arranged as and for the purpose described.

In testimony whereof I hereunto aiix my signature in thepresenoe of two witnesses.

A. P. MCRAE, J. L. GIBEAU. 

